6.0L Power Stroke Engine and DrivetrainDiscussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

You shouldn't need an additive if your regular maintenance has been done. Having said that I ran a cycle of Rev-x through mine when I first bought it to help fight the stiction issue I was having. That coupled with the change to a full synthetic oil helped some but the previous owners botched job of maintaining the rig caught up to it. My advice is run Rotella T6 5W-40 full synthetic oil and Rev-x. This is what I'll be running starting with the next oil change which is about 110 miles from now. The Rev-x may not be needed but the extra few bucks every 5000 miles gives me some peace of mind.

Might work good for a gasser, but the HEUI injection system on our engines destroys the viscosity of engine oil.

Unless you get your oil analyzed by a lab and come up with these results time and time again you are making this up(or you fall into the "severe driving" category).

If you are someone who races from stop light to stop light, you might have broken down your oil at 5K miles. If you live in arctic conditions then you would need the 5W40 oil. Otherwise FOLLOW YOUR OWNERS MANUAL for scheduled maintenance. I see these guy running "their own schedule" and they are the same ones that come in with blown head gaskets, turbos with wiped bearings, injector sticking issues and EGR's coked up with soot.

On paper yes, in the real world no! 5w40 synthetic is a much easier start on the injectors, starter and batteries (and intimately the FICM because the batteries wear out faster). Repeated cold start wear over time has proven to cause problems with the injectors of these trucks.

While I don't have a study to prove this, all you have to do is listen to a low temp cold start of these trucks with the two different oils in them to tell the difference. Experience gained over time shows that the 5w40 helps with injector life. It may be anecdotal evidence, but the consistence and number of the reports tends to prove the theory.

While I don't have a study to prove this, all you have to do is listen to a low temp cold start of these trucks with the two different oils in them to tell the difference. Experience gained over time shows that the 5w40 helps with injector life. It may be anecdotal evidence, but the consistence and number of the reports tends to prove the theory.

Have you ever heard of the placebo effect? I run 15W40 in my wifes '05 and my brother in law runs 5W40 in his '03. Side by side overnight on a 35 degree night with no block heaters plugged in they sounded the same on initial startup. Both trucks are in the 180-190K mile range and 100% stock as far as engine tuning is concerned. Most people want to believe that if they spend more on the oil they are getting something of value out of it.

I have learned a lot over the years visiting this web site. A great deal of that information has been dispensed by Bismic and Dieselmac (Also, Ford Doctor- who was not mentioned in this thread).
I don't usually respond to threads- I just read and learn, but I felt compelled, due to the negative replies in this thread by another member.

To: Dieselmac and Bismic: I appreciate the time you spend responding to threads. You saved my truck multiple times. I'm sure I speak for other members also.

I have learned a lot over the years visiting this web site. A great deal of that information has been dispensed by Bismic and Dieselmac (Also, Ford Doctor- who was not mentioned in this thread).
I don't usually respond to threads- I just read and learn, but I felt compelled, due to the negative replies in this thread by another member.

To: Dieselmac and Bismic: I appreciate the time you spend responding to threads. You saved my truck multiple times. I'm sure I speak for other members also.

I can only assume that you are referring to my comments, though I do not see how they are in any way shape or form negative. There is a lot of good information and personal experiences to be had on this site as well. The biggest problem with web forums is that they typically only attract people that have problems with whatever that forum is focused on. Here is happens to be Ford trucks. Once they get the answer that they are looking for they move on till the next problem arises and they are back b@#$%^&* again. I will say it again, almost all problems with this motor are self inflicted from people not following the proper maintenance schedule for their vehicle.

The bottom line though is the information that can be had here on this forum or any other forum is that the information is worth what you pay for it.

Have you ever heard of the placebo effect? I run 15W40 in my wifes '05 and my brother in law runs 5W40 in his '03. Side by side overnight on a 35 degree night with no block heaters plugged in they sounded the same on initial startup. Both trucks are in the 180-190K mile range and 100% stock as far as engine tuning is concerned. Most people want to believe that if they spend more on the oil they are getting something of value out of it.

In my mind 35 degrees would not be a good "test". Try it at 20 degrees or colder and the difference is noticeable. My truck will run rough and is noisy at those temps with 15w40 but with 5w40 it runs okay and is not noisy at all. I am trying 10w30 this winter and so far it is performing in between the other two oils. I don't plug the truck in unless it drops below zero.
And to the OP, I don't use any additive in the oil. Just regular oil/filter changes.

Unless you get your oil analyzed by a lab and come up with these results time and time again you are making this up(or you fall into the "severe driving" category).

If you are someone who races from stop light to stop light, you might have broken down your oil at 5K miles. If you live in arctic conditions then you would need the 5W40 oil. Otherwise FOLLOW YOUR OWNERS MANUAL for scheduled maintenance. I see these guy running "their own schedule" and they are the same ones that come in with blown head gaskets, turbos with wiped bearings, injector sticking issues and EGR's coked up with soot.

I'm not making anything up. If you understand how a HEUI injector works, then it's not too much of a leap to comprehend the viscosity breakdown phenomenon.

Yes, I am a severe service driver. As are most who use the truck as it was intended. And yes, I've had an unbelievable amount of oil analysis' performed and have no doubt about the relationship between viscosity and the OCI (among other things). That's why I am a strong opponent of extended OCI's.

FORD HAS RECOMMENDED 5W40 at -20*F to 100*F, IIRC, for these engines for a long time. But I'm sure you knew that.

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